Who accompanied the Trumps?Mr Trump was joined by his son-in-law Jared Kushner, who is Jewish, and his daughter Ivanka, who converted to Judaism when she married Mr Kushner. Both are White House advisers.

Treasury Secretary Steven Mnuchin, who is Jewish, also joined the president.

Before his visit, the president condemned anti-Semitism. The alleged gunman was not a Trump supporter.

Why are there protests?Critics accuse Mr Trump of fomenting a surge in white nationalist and neo-Nazi activity through divisive rhetoric which has seen him criticise immigrants and Muslims in particular.

They held signs with such slogans as "We build bridges not walls"; "Trump, Renounce White Nationalism Now"; and "Trump's lies kill".

During the presidential visit, one protester holding a baby was seen by reporters calling out: "We didn't invite you here."

Whose funerals were held on Tuesday?Earlier on Tuesday, mourners paid their respects to four victims of the massacre.

Brothers David and Cecil Rosenthal, who were aged 54 and 59, were among the first to be buried. They were the youngest victims of the shooting.

During a packed prayer service for the siblings, Rabbi Myers said: "They could illustrate a dictionary definition for 'pure souls'."

Daniel Stein, 71, and Jerry Rabinowitz, 66, were also laid to rest.

Mr Rabinowitz was a doctor, known for his work with gay men diagnosed with HIV. On Saturday, he was shot and killed after he rushed to help the wounded, his nephew Avishai Ostrin said in an emotional Facebook post.

Support for the community has been pouring in from across the country.

A GoFundMe page created by an Iranian refugee studying in Washington DC, who has no connection to the Pittsburgh community, has already accumulated $900,000 (£700,000) to help rebuild the synagogue and support victims' families.

Another fund set up by Muslim-American groups to help pay for funeral costs has raised $200,000.

What of the suspected gunman?Robert Bowers, 46, is now in the custody of US marshals and faces 29 criminal charges.

He was discharged from hospital on Monday after being treated for multiple gunshot wounds.

During his first court appearance on Monday, Bowers waived his detention hearing and requested a public defender, US media reported.